Why did Prophet Muhammad's enemies praise him to others?

Abu Sufyan Sakhr ibn Harb said in a long hadith concerning what happened with Heraclius: "Heraclius said, "What does he order you to do?" I replied, "He says, "Worship Allah alone and do not associate anything with Him and abandon what our ancestors said." He commands us to pray, to... show more Abu Sufyan Sakhr ibn Harb said in a long hadith concerning what happened with Heraclius: "Heraclius said, "What does he order you to do?"
I replied, "He says, "Worship Allah alone and do not associate anything with Him and abandon what our ancestors said." He commands us to pray, to speak the truth, to be chaste, and to maintain ties of kinship."
Update: @Mark: read the question. Abu Sufyan was talking to Heraclius (Emperor of the Byzantine (Eastern Roman) Empire)
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